hurbie Posted April 23, 2021 Share Posted April 23, 2021 hello all , as some of you may know , i'm building the "eurover 110" , one question i can't solve at the moment is do i go with a 3bolt steering box , or is a 4 bolt really a beter option . i have the (used) original 3 bolt from a french LHD 110 (probebly around 1984) , and i have a 4 bolt from a salvage yard , (should be from a discovery 2) both need rebuilding , but wich is the better/stronger option. i know the main difference is a brass bush in the 3 bolt , vs a bearing in a 4 bolt. what about the hosses , the engine is a 200tdi (defender spec) , do hoses exist for a 200tdi pump to a 3 bolt ? or do i need to get a custom hose made (or swap to a older steering pump). so , i need some advice 🙂 Quote Link to comment Share on other sites More sharing options...
western Posted April 23, 2021 Share Posted April 23, 2021 4 bolt more popular & easier to obtain a replacement. 200Tdi had a 4 bolt steering box from new, Quote Link to comment Share on other sites More sharing options...
miketomcat Posted April 23, 2021 Share Posted April 23, 2021 If your using a 200tdi you would need special hoses to fit a 3 bolt as they are imperial. You can buy hoses/pipe off the shelf to connect a 4 bolt to a 200tdi. Mike Quote Link to comment Share on other sites More sharing options...
hurbie Posted April 24, 2021 Author Share Posted April 24, 2021 is there any difference in quality ? Quote Link to comment Share on other sites More sharing options...
miketomcat Posted April 25, 2021 Share Posted April 25, 2021 Not that I'm aware of. The three bolt that was on our 110 looked to be original so 30 years and 150k miles. I changed it because the drop arm kept coming loose. The 6 bolt is supposed to be heavy duty and is a straight swap for the four bolt but again that's metric (off the shelf for a 200tdi) hoses so doesn't fit three bolt hoses. Mike Quote Link to comment Share on other sites More sharing options...
hurbie Posted April 25, 2021 Author Share Posted April 25, 2021 i'll have a look inside the 4 bolt then , i have the rebuilt kit. now i only need to find a drop arm and nut for this one (i gues the 3 bolt doesn't fit the 4 bolt) Quote Link to comment Share on other sites More sharing options...
western Posted April 25, 2021 Share Posted April 25, 2021 Pretty sure a 3 bolt drop arm only fits that box, a drop arm for a 4 bolt also fits a 6 bolt, I know that as my 110 had a 6 bolt box & I reused the drop arm on the replacement 4 bolt box. There are LHD & RHD versions you would need to find part number QFW000030 which is for LHD vehicles new drop arms over here on Brit-car website --- https://www.brit-car.co.uk/search.php?query=4+bolt+drop+arm+&xBrand=&part_type=&xSupplierID=&product-sort=&xPerPage=10 Quote Link to comment Share on other sites More sharing options...
hurbie Posted April 25, 2021 Author Share Posted April 25, 2021 i think i need to investigate some more , so far i have found lots of different partnumbers (with lot's of superceded numbers with them) , and some info even mention that 3 and 4 bolt droparms are the same .... i did found the QFW000030 . 1 Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted April 25, 2021 Share Posted April 25, 2021 My understanding was that 3-bolt and 4-bolt boxes (both Adwest) share the same drop arm, however the pipe fittings are different with the former being imperial of some kind (presumably BSP or similar) and the latter metric. The 6-bolt boxes are made by Gemmer and have a different spline shape so the drop arms are different. They do however share the same pipe fitting threads as the later 4-bolt Adwest boxes, so can be swapped easily so long as you get the arm. I swapped a 6-bolt for a 4-bolt in my 200Tdi years ago, pipes went straight over no bother. Quote Link to comment Share on other sites More sharing options...
western Posted April 25, 2021 Share Posted April 25, 2021 Now I'm not sure about my post above, I think I scrapped the 6 bolt box & its drop arm. this one says it fits4 & 6 bolt box. https://www.brit-car.co.uk/product.php/209681/5497/drop_arm__man_4_bolt_pas_6_bolt_box & this one says 3 & 4 bolt box https://www.brit-car.co.uk/product.php/418921/0/power_steering_drop_arm___joint_left_hand_drive__3_4_bolt___defender___discovery_1 Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted April 25, 2021 Share Posted April 25, 2021 The 3 bolt on my Sandringham is massive compared to the 4 bolt on my 300Tdi. Not sure if it's a heavy duty version though. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted April 25, 2021 Share Posted April 25, 2021 The three bolt is quite a bit bigger. I'm fairly sure I swapped the drop arm on our three bolt as it kept coming loose and I think retro is correct. Mike Quote Link to comment Share on other sites More sharing options...
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